单项选择题

The old man, ______ abroad for twenty years, is on the way back to his motherland.

A．to work
B．working
C．to have worked
D．having worked
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When do you think ______ visit her uncle
A．she was going to
B．will she go to
C．she will go
D．she will go to
单项选择题
The disease spread very quickly, but thanks to the help of the soldiers, all the people ______ were sent to big hospitals.
A．infect
B．infecting
C．infected
D．being infected
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